381 lines
10 KiB
C
381 lines
10 KiB
C
/*
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* Xilinx XPS PS/2 device driver
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*
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* (c) 2005 MontaVista Software, Inc.
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* (c) 2008 Xilinx, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/serio.h>
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#include <linux/interrupt.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/io.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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#define DRIVER_NAME "xilinx_ps2"
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/* Register offsets for the xps2 device */
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#define XPS2_SRST_OFFSET 0x00000000 /* Software Reset register */
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#define XPS2_STATUS_OFFSET 0x00000004 /* Status register */
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#define XPS2_RX_DATA_OFFSET 0x00000008 /* Receive Data register */
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#define XPS2_TX_DATA_OFFSET 0x0000000C /* Transmit Data register */
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#define XPS2_GIER_OFFSET 0x0000002C /* Global Interrupt Enable reg */
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#define XPS2_IPISR_OFFSET 0x00000030 /* Interrupt Status register */
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#define XPS2_IPIER_OFFSET 0x00000038 /* Interrupt Enable register */
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/* Reset Register Bit Definitions */
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#define XPS2_SRST_RESET 0x0000000A /* Software Reset */
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/* Status Register Bit Positions */
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#define XPS2_STATUS_RX_FULL 0x00000001 /* Receive Full */
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#define XPS2_STATUS_TX_FULL 0x00000002 /* Transmit Full */
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/* Bit definitions for ISR/IER registers. Both the registers have the same bit
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* definitions and are only defined once. */
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#define XPS2_IPIXR_WDT_TOUT 0x00000001 /* Watchdog Timeout Interrupt */
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#define XPS2_IPIXR_TX_NOACK 0x00000002 /* Transmit No ACK Interrupt */
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#define XPS2_IPIXR_TX_ACK 0x00000004 /* Transmit ACK (Data) Interrupt */
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#define XPS2_IPIXR_RX_OVF 0x00000008 /* Receive Overflow Interrupt */
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#define XPS2_IPIXR_RX_ERR 0x00000010 /* Receive Error Interrupt */
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#define XPS2_IPIXR_RX_FULL 0x00000020 /* Receive Data Interrupt */
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/* Mask for all the Transmit Interrupts */
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#define XPS2_IPIXR_TX_ALL (XPS2_IPIXR_TX_NOACK | XPS2_IPIXR_TX_ACK)
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/* Mask for all the Receive Interrupts */
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#define XPS2_IPIXR_RX_ALL (XPS2_IPIXR_RX_OVF | XPS2_IPIXR_RX_ERR | \
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XPS2_IPIXR_RX_FULL)
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/* Mask for all the Interrupts */
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#define XPS2_IPIXR_ALL (XPS2_IPIXR_TX_ALL | XPS2_IPIXR_RX_ALL | \
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XPS2_IPIXR_WDT_TOUT)
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/* Global Interrupt Enable mask */
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#define XPS2_GIER_GIE_MASK 0x80000000
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struct xps2data {
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int irq;
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u32 phys_addr;
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u32 remap_size;
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spinlock_t lock;
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u8 rxb; /* Rx buffer */
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void __iomem *base_address; /* virt. address of control registers */
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unsigned int dfl;
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struct serio serio; /* serio */
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};
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/************************************/
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/* XPS PS/2 data transmission calls */
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/************************************/
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/*
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* xps2_recv() will attempt to receive a byte of data from the PS/2 port.
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*/
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static int xps2_recv(struct xps2data *drvdata, u8 *byte)
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{
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u32 sr;
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int status = -1;
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/* If there is data available in the PS/2 receiver, read it */
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sr = in_be32(drvdata->base_address + XPS2_STATUS_OFFSET);
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if (sr & XPS2_STATUS_RX_FULL) {
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*byte = in_be32(drvdata->base_address + XPS2_RX_DATA_OFFSET);
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status = 0;
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}
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return status;
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}
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/*********************/
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/* Interrupt handler */
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/*********************/
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static irqreturn_t xps2_interrupt(int irq, void *dev_id)
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{
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struct xps2data *drvdata = dev_id;
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u32 intr_sr;
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u8 c;
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int status;
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/* Get the PS/2 interrupts and clear them */
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intr_sr = in_be32(drvdata->base_address + XPS2_IPISR_OFFSET);
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out_be32(drvdata->base_address + XPS2_IPISR_OFFSET, intr_sr);
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/* Check which interrupt is active */
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if (intr_sr & XPS2_IPIXR_RX_OVF)
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printk(KERN_WARNING "%s: receive overrun error\n",
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drvdata->serio.name);
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if (intr_sr & XPS2_IPIXR_RX_ERR)
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drvdata->dfl |= SERIO_PARITY;
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if (intr_sr & (XPS2_IPIXR_TX_NOACK | XPS2_IPIXR_WDT_TOUT))
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drvdata->dfl |= SERIO_TIMEOUT;
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if (intr_sr & XPS2_IPIXR_RX_FULL) {
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status = xps2_recv(drvdata, &drvdata->rxb);
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/* Error, if a byte is not received */
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if (status) {
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printk(KERN_ERR
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"%s: wrong rcvd byte count (%d)\n",
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drvdata->serio.name, status);
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} else {
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c = drvdata->rxb;
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serio_interrupt(&drvdata->serio, c, drvdata->dfl);
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drvdata->dfl = 0;
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}
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}
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if (intr_sr & XPS2_IPIXR_TX_ACK)
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drvdata->dfl = 0;
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return IRQ_HANDLED;
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}
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/*******************/
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/* serio callbacks */
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/*******************/
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/*
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* sxps2_write() sends a byte out through the PS/2 interface.
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*/
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static int sxps2_write(struct serio *pserio, unsigned char c)
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{
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struct xps2data *drvdata = pserio->port_data;
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unsigned long flags;
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u32 sr;
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int status = -1;
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spin_lock_irqsave(&drvdata->lock, flags);
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/* If the PS/2 transmitter is empty send a byte of data */
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sr = in_be32(drvdata->base_address + XPS2_STATUS_OFFSET);
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if (!(sr & XPS2_STATUS_TX_FULL)) {
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out_be32(drvdata->base_address + XPS2_TX_DATA_OFFSET, c);
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status = 0;
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}
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spin_unlock_irqrestore(&drvdata->lock, flags);
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return status;
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}
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/*
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* sxps2_open() is called when a port is open by the higher layer.
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*/
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static int sxps2_open(struct serio *pserio)
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{
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struct xps2data *drvdata = pserio->port_data;
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int retval;
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retval = request_irq(drvdata->irq, &xps2_interrupt, 0,
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DRIVER_NAME, drvdata);
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if (retval) {
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printk(KERN_ERR
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"%s: Couldn't allocate interrupt %d\n",
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drvdata->serio.name, drvdata->irq);
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return retval;
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}
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/* start reception by enabling the interrupts */
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out_be32(drvdata->base_address + XPS2_GIER_OFFSET, XPS2_GIER_GIE_MASK);
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out_be32(drvdata->base_address + XPS2_IPIER_OFFSET, XPS2_IPIXR_RX_ALL);
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(void)xps2_recv(drvdata, &drvdata->rxb);
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return 0; /* success */
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}
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/*
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* sxps2_close() frees the interrupt.
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*/
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static void sxps2_close(struct serio *pserio)
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{
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struct xps2data *drvdata = pserio->port_data;
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/* Disable the PS2 interrupts */
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out_be32(drvdata->base_address + XPS2_GIER_OFFSET, 0x00);
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out_be32(drvdata->base_address + XPS2_IPIER_OFFSET, 0x00);
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free_irq(drvdata->irq, drvdata);
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}
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/*********************/
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/* Device setup code */
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/*********************/
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static int xps2_setup(struct device *dev, struct resource *regs_res,
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struct resource *irq_res)
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{
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struct xps2data *drvdata;
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struct serio *serio;
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unsigned long remap_size;
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int retval;
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if (!dev)
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return -EINVAL;
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if (!regs_res || !irq_res) {
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dev_err(dev, "IO resource(s) not found\n");
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return -EINVAL;
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}
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drvdata = kzalloc(sizeof(struct xps2data), GFP_KERNEL);
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if (!drvdata) {
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dev_err(dev, "Couldn't allocate device private record\n");
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return -ENOMEM;
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}
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dev_set_drvdata(dev, drvdata);
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spin_lock_init(&drvdata->lock);
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drvdata->irq = irq_res->start;
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remap_size = regs_res->end - regs_res->start + 1;
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if (!request_mem_region(regs_res->start, remap_size, DRIVER_NAME)) {
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dev_err(dev, "Couldn't lock memory region at 0x%08X\n",
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(unsigned int)regs_res->start);
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retval = -EBUSY;
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goto failed1;
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}
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/* Fill in configuration data and add them to the list */
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drvdata->phys_addr = regs_res->start;
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drvdata->remap_size = remap_size;
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drvdata->base_address = ioremap(regs_res->start, remap_size);
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if (drvdata->base_address == NULL) {
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dev_err(dev, "Couldn't ioremap memory at 0x%08X\n",
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(unsigned int)regs_res->start);
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retval = -EFAULT;
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goto failed2;
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}
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/* Disable all the interrupts, just in case */
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out_be32(drvdata->base_address + XPS2_IPIER_OFFSET, 0);
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/* Reset the PS2 device and abort any current transaction, to make sure
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* we have the PS2 in a good state */
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out_be32(drvdata->base_address + XPS2_SRST_OFFSET, XPS2_SRST_RESET);
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dev_info(dev, "Xilinx PS2 at 0x%08X mapped to 0x%p, irq=%d\n",
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drvdata->phys_addr, drvdata->base_address, drvdata->irq);
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serio = &drvdata->serio;
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serio->id.type = SERIO_8042;
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serio->write = sxps2_write;
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serio->open = sxps2_open;
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serio->close = sxps2_close;
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serio->port_data = drvdata;
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serio->dev.parent = dev;
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snprintf(serio->name, sizeof(serio->name),
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"Xilinx XPS PS/2 at %08X", drvdata->phys_addr);
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snprintf(serio->phys, sizeof(serio->phys),
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"xilinxps2/serio at %08X", drvdata->phys_addr);
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serio_register_port(serio);
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return 0; /* success */
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failed2:
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release_mem_region(regs_res->start, remap_size);
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failed1:
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kfree(drvdata);
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dev_set_drvdata(dev, NULL);
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return retval;
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}
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/***************************/
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/* OF Platform Bus Support */
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/***************************/
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static int __devinit xps2_of_probe(struct of_device *ofdev, const struct
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of_device_id * match)
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{
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struct resource r_irq; /* Interrupt resources */
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struct resource r_mem; /* IO mem resources */
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int rc = 0;
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printk(KERN_INFO "Device Tree Probing \'%s\'\n",
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ofdev->node->name);
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/* Get iospace for the device */
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rc = of_address_to_resource(ofdev->node, 0, &r_mem);
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if (rc) {
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dev_err(&ofdev->dev, "invalid address\n");
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return rc;
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}
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/* Get IRQ for the device */
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rc = of_irq_to_resource(ofdev->node, 0, &r_irq);
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if (rc == NO_IRQ) {
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dev_err(&ofdev->dev, "no IRQ found\n");
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return rc;
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}
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return xps2_setup(&ofdev->dev, &r_mem, &r_irq);
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}
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static int __devexit xps2_of_remove(struct of_device *of_dev)
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{
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struct device *dev = &of_dev->dev;
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struct xps2data *drvdata;
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if (!dev)
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return -EINVAL;
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drvdata = dev_get_drvdata(dev);
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serio_unregister_port(&drvdata->serio);
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iounmap(drvdata->base_address);
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release_mem_region(drvdata->phys_addr, drvdata->remap_size);
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kfree(drvdata);
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dev_set_drvdata(dev, NULL);
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return 0; /* success */
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}
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/* Match table for of_platform binding */
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static struct of_device_id xps2_of_match[] __devinitdata = {
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{ .compatible = "xlnx,xps-ps2-1.00.a", },
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{ /* end of list */ },
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};
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MODULE_DEVICE_TABLE(of, xps2_of_match);
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static struct of_platform_driver xps2_of_driver = {
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.name = DRIVER_NAME,
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.match_table = xps2_of_match,
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.probe = xps2_of_probe,
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.remove = __devexit_p(xps2_of_remove),
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};
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static int __init xps2_init(void)
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{
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return of_register_platform_driver(&xps2_of_driver);
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}
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static void __exit xps2_cleanup(void)
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{
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of_unregister_platform_driver(&xps2_of_driver);
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}
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module_init(xps2_init);
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module_exit(xps2_cleanup);
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MODULE_AUTHOR("Xilinx, Inc.");
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MODULE_DESCRIPTION("Xilinx XPS PS/2 driver");
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MODULE_LICENSE("GPL");
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